Abstract: The weight of the tension leg platform's topside, which belongs to floating structure, has great impact on the general layout of the hull, while living quarters is an important component of platform's topside. On the basis of optimization of general layout of the living quarters, we compare and analyze the relevant structure type and outfitting materials, properly select the structure type and outfitting materials of the living quarters and propose the scheme of lightweight living quarters, ultimately realizing the purpose of reducing weight of the platform and improving economic efficiency of the hull.